Article of manufacture.



Unrtrnn STATES rarnn'r onrrcn.

GUSTAV PISTOR AND PAUL RAKOWIGZ, OF GRIESHEIM, GERMANY, ASSIGNOBS TOGHEMISGHE FABRIK GRIESHEIM ELECTRON, OF FRANKFORT-ON-THEMAIN; GER- MANY,A CORPORATION OF GERMANY.

ARTICLE MANUFACTURE.

No Drawing.

To all whom it may concern: I

Be it known that we, GUSTAV PISTOR and PAUL RAKoWIcz, Subjects of theGerman Emperor, and residing at Griesheim-on-the- Main, Germany, haveinvented certain new and useful Improvements in Articles of Manufacture,of which the following is a specification.

This invention relates 'to improvements in metal articles designed foruse in the manufacture of machines and apparatus, in constructions, andbroadly in the mechanical industry, in which lightness, tenacity,relative extension, elasticity, capability of being worked andresistance to influences of the atmosphere are ofimportance. Thesubject-matter of the invention combines the aforesaid properties whichare of importance in the mechanical industries in a degree which was notattained in articles of any character heretofore in use. It has beendiscovered that articles of the aforesaid properties can be producedfrom high percentage magnesium alloys which contain from 80%.

to 99.5% of magnesium and from 0.5'to 20% of foreign metal or metalsapart from themagnesium. The hi h percentage magnesium alloys can readiy be worked by means of any tool either byhand or by machine. They canbe soldered, welded and forged. Casts made from the said high percentagealloys of magnesium are perfect in every respect. With a fresh polishthey have a beautiful color resembling that of the silver and a goodluster. As to atmospheric influences they have about the same resistanceas tin or' copper. A thin layer of magnesium oxid thoroughly protectsthe metal against any deeper attack. By condensing processes, such forexample as pressing, rolling, drawing, etc;, and also by thermicimproving processes to which the metal is subjected, the properties, andparticularly the tenacity, relative extension, and elasticity, areconsiderably improved, without materially increasing the specificgravity of the same.

Heretofore high percentage alloys of magnesium with lead, zinc andthallium have been used in pyrotechnics, as has been described inBrannt, Metallic Alloys, Henry Garey Baird & (10., Pennsylvania, 1896,page 35, lines 1 to 6. This however is immaterial as far as the presentinvention is concerned, whichrelates to articles of the mechanicalSpecification of Letters Patent.

Patented July26, 1910.

Application filed April 12, 1969. Serial No. 489,476.

industry, which have nothing to do with pyrotechnical purposes, andwhich involve an important progress in the art by reason of their newlydiscovered properties.

The properties of the articles which form the subject-matter of thisinvention can be modified by the quality and the quantity of the metalor metals to be alloyed with the' magnesium. For example, if greatimportance be attached to a low specific gravity, additions upto 20 percent. of light metals such as calcium, or aluminium, can be used therebyimproving the excellent physical properties of the magnesium. Thus, forinstance, an alloy of 92 per cent. of magnesium and 8 per cent. ofaluminium possesses a specific gravity of only 1.75, a strength andextensibility which are equal to those of the best gun-metal.Improvement in the physical properties of the magnesium is also obtainedby the addition of heavier "metals. Thus alloys of magnesium and zinc,and magnesium and copper, produced with due regard to the aforesaidpercentage limits are greatly superior. in their physical properties tothe usual aluminium or its alloys. The.

applications of the said high percentage magnesium alloys are Veryextensive on account of the aforenamed properties, especially theirunusually small specific gravity, great density, tensile strength andtoughness, giving great reduction in Wei ht and cost. They will be ofgreat value' or many purposes in the whole mechanical industry;especially for instance for automobiles, and apparatus used inaeronautics, and navigation, and for military and sporting purposes, andgenerally for machinery, instruments, mountings, electric apparatiis andfine mechanical work and even for jewelry, and for bell making. The useof magnesium 1n the metal industry has hitherto been limlted'to itsapplication as de-oxidizing agent and as a metal purifyin agent infoundries. In the latter cases t e magnesium rema ns in the resultingmetals, or alloys, only in a very small proportion. An application ofmagnesium in the mechanical industry has been in making We claim:

1. An article of manufacture capable of resisting mechanical stressesand sultable to be used in the mechanical industry, consisting of analloy containing not less than 80% and not more than 99.5% of magnesium.

An article of manufacture ca able of reslsting mechanical stresses andsuitable to 'be used in the mechanical industry, consisting of an alloycontaining not less than 80% and not more than99.5% of magnesium, and

not more than 20% or less than 0.5% of aluminum.

In testimony whereof we have signed our names to this specification inthe presence of 15 two subscribing witnesses.

GUSTAV PI STOR. PAUL RAKOWIGZ.

Witnesses FRANZ HAPsLAcnnR, ERWIN DlPPEL.

